Japanese Egg Molds!

Pay no attention to the retarded looking bear in the upper right corner ;)

 So I got these egg molds from a Japanese store of household wares in Houston, Texas.  Since the instructions on the packaging were in Japanese, i had no idea how to use them, or if it were for eggs!  I was actually thinking for sushi.  But recently I thought, just ask the internets! and behold Fun with Japanese egg molds popped up.  Google knows everything. =)     These are pretty sweet, and they're so easy to make, but as evidenced in the picture they don't always turn out perfect hahaha!  Gonna try using them for sushi next!  How about maybe shaped mochii?    Any other ideas?  Comments welcome!